Valve-operating mechanism.



T. F RAINSFORD.

VALVE OPERATING MECHANISM.

APPLICATION FILED OCT. 13, l9l2. 1,137,532 Patented Apr. 27, 1915.

"'"2 SHEETSSHE ET 1.

Wn-eJJea T. F. RAINSFORD.

VALVE OPERATING MECHANISM.

APPLICATION FILED OCT. I8 1912- 1 13? gg Patented Apr. 27, 1915.

2SHEETSSHEET 2.

THOMAS E. RAINSFGBB, Oi GLEVELANI}, S13E 3.

VALVE-0PEBATING lliECEAN Specification of Letters tlpplicatioii filedflct'obcr is, 1512. Serial]. Ho. recess.

T all whom it may concern Be it known that I, TrioMAs F. Reme- FORD, acitizen of the United States, residing at Cleveland, in the county ofCuyehoge and State of Ohio, have invented e certain new and usefulImprovement in Valve-peretin Mechanism, of which the following is alull, clear, and exact description,

This invention reletes to improvements in valve operating mechanism forreciprocst ing slide valves of internel coinhsstion engines, whereinasing'le valve controls bo h the admission end exhaust for one cylinder,the present invention being an improvement over the valve gear or velveopereting mechanism disclosed in my epplicetion,-Seriel No. 687,572,filed April 1st, 1912,

The object of this invention is to provide a valve gear for a, valve ofthis character, which is simple in construction silent in operotion, andgives to the valve the variable movements necessary for it to functionproperly and to produce high efficiency.

My invention may be briefly summarized as consisting in certain noveldetails of construction and combinations and arrangements of parts whichwill be described in the specification and set forth in the appendedclaims, A

In the accompanying sheets of drawings, Figure 1 is a transversesectional view with parts in elevation; Fig. 2 is a partial longitudinalsectional view with parts in elevetion, the section losing taken partlyalong the irregular line 2-2 of Fi n 1; Fig. 3 is o, detail view of theprincipal parts oi": the valve operating mechanism.

Referring now to the drawings 5: have shown e multiple cylinder engineembodying my invention which comprises cylinders 10, each containing apiston 11 connected by the usual connecting rod 12 to a crank shaft 13inclosed within the crank case 14. At the side of each cylinder is avalve chamber 15, cylindrical in shape and containing a fixed sleeve orbushing .16 in which is adepted to reciprocate an endwise, movablepiston slide valve 17 which controls both the admission of gases to andthe exhaust of gases from the cylinder with which the valve isassociated.

' At ab t the middle of the sleeve 16 is a series of ports 18 which areconneo upper part of "he cyliiider by e 19 common to hoth the ingc n inggases. Above the ports orts 20 which communicate fold 21 which is inthis o manifold, endloelow the "no oi: ports 22 which comm fold 93, whlis iii this c The velve l the middle engage o each end, end vided with cream when the valve sitien, it opp" ries of ports 28 21 will he placed1' pessegewev 19 est and the middle when the velve is raised. tion, thelower of inlet manifold 28 will be cation with the pessegewl valvechemoer is (36? wardly end communicates wi chamber 14-, and the valve ishe therecen he a direct of 1 currents through. the o, chamber throughthe vslve crank sees, this circulation the velve being sensed bypistons, inasmuch the eerhureter is co; as fully described abovereferred to; For operating the velve employ gear which includes erotating or equivalent eccentric device n i driven from the main ore lcshaft 3.3 half the speed of the mein crenli through suitable drivingmechanism shown as chain. and sprocket ge ri d 1 meted as a whole by thereference cii 26. An arm or-lever 2? is pivotell com; Us ed at one endto the crank and so its oppc site end is pivot-ally connected to a valvere 28, which at its upper end hes e p' connection with the valve. Forcontrclli the movement of the lower end of the valve rod, or theconnection between the lower enc of this rod and the inner end of Iemploy a fulcruming device which is movable relative to the armand inthis case consists of a link 29 which "is pivotally con nected at itsupper end to a stationary pinor red 30, and at its lower end ispivotally connected to the arm 27, at a pointbetween the ends of saidarm. While} do not ca re to bec'onfin'ed to exact proportions orarrangements of parts, ex

cept as I am precisely limited by the terms of the appended claims, Iprefer that the link 29 be slightly longer than the throw of the crankarms 27 and the link 29, but for all the vertically and is 37) fulcrumfor the arm 40 There is, however,

25, the to the valves 1 use the same crank shaft several arms 27 beingconnected cranks of said crank shaft.

It will be seen that the arm 27 is oscillated also moved 'endwise, andthat the link 29 controls the path of move merit of the axis ofconnection between the valve rod and the arm 27, and serves .as asuspending link for the arm 27 as a movable and as a crank for movingthe arm about the axis of the crank 25. In "fact, the link and crank, bytheir combined action, cause the axis of connection be tween the arm 27and valve rod to move in that there is quick opening the inlet andexhaust ports, and both the inlet and exhaust ports are lnaintaiuedclosed during a major portion of the compression and working strokes. aparticularly quick downward movement given to said axis of connectionand hence to the valve, to cause the opening of the exhaust port, andalso the valve is moved very quickly from its lowerfi most position toits uppermost position to Ne w close the exhaust ports.

In Fig. l and also shown in its mid-position, and the piston is about tostart on its working stroke. During the movement of the valve actuatingcrank, for about 90 from the position shown in Fig. 1, very littlevertical movement will be imparted to the valve, for the reason thatboth the crank and the link 29 are swinging in the direction or to theright, as the mechanism is viewed in Fig. 1. Near the close of theworking stroke, the valve is given a quick thrust downward to open theexhaust ports, this being due to the fact that the valve operating crankis still moving upwardly, thus rocking the'arm 27 about the connectionof said arm with the link as the fulcrum, and at the same-time, the link29 re ports and to open the inlet the arm 27,

25, and that the link 29 he b a connected to the arm 27 nearer the endof which the valve rod is con connected to "the,

It will be understood that for gradually converted connection of the armin Fig. 3, the valve is ling the admission to moving downwardly or"to-the lefathus rocking the arm 27 about the connection of said armwith the crank as the fulcrum.

.At' or near the time that the valve actu ating crank reaches itsuppermost position, the valve is given a long quick upward strokeuppermost position, causing the closure of the exhaust ports and anopening of the inlet ports, this quick upward movement being due to thefact that the crank is ing downwardly and the link is swinging upwardly.Thence the valve is moved downward to "its mid-position by the comineddownward movements of the crank and link, and when the inlet port isclosed, the vertical movement of the connection between the arm andvalve rod .is

horizontal movement, which as before stated, imparts very littlevertical movement to the valve and causes the ports to be maintainedclosed during a major portion of the compression and working strokes.This series of movements'are then repeated for the next cycle of engineoperation. I

Preferably, the three axes or centers of link 29 and valve rod 28 are ona straight line. The advantages of this arrangement over one wherein thethree axes of connection are not on a straight lineor on substantially astraight line, are, a more freely swinging construction, the arm is notsub jected to locking strains when the arm is tilted into any of itsextreme positions; in: creased leverage between the pomts of cornnection of the arm with the link and valve rod. This latter advantageresults in faster valve motion at certain points of the cycle of engineoperation, and permits the use of greater lap in the valve.

Having thus described my invention, what 1. In combination in aninternal combustion engine, a cylinder, a slide valve controlling theadmission to and exhaust of gases from thecylinder, a valve operatingmecha nism comprising a rotating member, an arm eccentrically connectedthereto, a valve rod connected to the valve and pivotally connected tosaid arm, and a, swinging link pivotally connected to said arm betweensaid rotating member and the valve rod, the axes of connection of saidarm with. the rotating member, with the link, and with the rod being ina substantially straight line.

2. In combination in an internal combustion engine, a cylinder, a slidevalve controland exhaust of gases from the cylinder, a valve operatingmechanism comprising a rotating member, an arm cccentrically connectedthereto, a valve rod connected to the valve and pivotally connected tosaid arm and a swinging link pivotally connected to said arm betweensaidrotating now swing= into a substantially. in

27 with the crank-25,

member and the valve rod, the axes of connection of said arm with therotating memher, with the link and with the rod being in a substantiallystraight line, said link being pivotally connected to a support abovethe arm and extending from said support downwardly to the arm. A

in testimony whereef, 1'. hereunte atfix my slgnature 1n the presence oftwo wltnesses.

